1. The Line-Input of my Macbook Pro 2.8 (late 2008) records phase-inverted! This happens with both Windows and OS X, so it seems to be happening in hardware.

2. The Realtek Windows driver shipping with Boot Camp is badly bugged. On the Input it clips everything above -12 dB hard, but only on the positive side of the waveform (negative is unharmed)! Fortunately this is fixed with the current R2.14 drivers.

This leaves the question of whether Apple has ever tested the line-input of it's shiney and expensive new Macbook Pros!?

Hmm.. I think most people will know the windows drivers supplied by Apple are a little dated, incase you ain't noticed. Instead of moaning about it, how about going to realtek's homepage and download newer drivers?

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